The bolt.
breech
Bolt
bolt
bolt
I would think the bolt sliding forward in the receiver would close the aperture.
bolt
small aperture= short focal range (this means less of the picture will be in focus...sounds like a bad thing but creates more artistic photos with blurry background and sharp subjects) large aperture= long focal range (objects far and close will remain in focus)
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$86.01 as of today's market close.
Underexposure without a change of lighting corresponding to your aperture.
This is a break barrel air rifle. Push the barrel down to open the breech and then load a pellet in the barrel. Pull the barrel all the way down to load the tension on the spring then close up the barrel. It's ready to shoot
section valve to be close before Type your answer here...